consider abstract field type parameters when inlining

git-svn-id: http://haxe.googlecode.com/svn/trunk@5977 f16182fa-f095-11de-8f43-4547254af6c6
mark found dispatch methods as @:keep (fixed issue #1432)

git-svn-id: http://haxe.googlecode.com/svn/trunk@5978 f16182fa-f095-11de-8f43-4547254af6c6